Joe, yes, you can place the header snippet in the Custom Code header area, though I can't guaranty that it would be just above the tag. . As for the body, that's a tough one. You could, in theory, add it to the footer scripts area, or, depending on what this code is, perhaps in a text widget in a universal or full width sidebar at the very bottom of the footer.
What's the code for, or where's it from? This might help me find a better solution for you.